From the pump to a gate valve,  to a tee, one hose to each manifold bottom,  from the outlet of the manifold to the front of the motor, from the thermostat housing twice, one to each riser......

To set up the valve,  idle it in the water with the valve wide open,  then slowly start to close the valve until the temperature gets to about 150°F. Take it out and beat it like it owes you money.

GT